package com.songlanyun.interceptor.iml;

import com.alibaba.fastjson.JSONObject;

import com.alibaba.fastjson.TypeReference;
import com.songlanyun.common.utils.RedisUtils;
import com.songlanyun.filter.RequestReaderHttpServletRequestWrapper;
import com.songlanyun.interceptor.RepeatSubmitInterceptor;
import org.apache.commons.lang.StringEscapeUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.cache.RedisCache;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;

import javax.servlet.http.HttpServletRequest;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * 判断请求url和数据是否和上一次相同，
 * 如果和上次相同，则是重复提交表单。 有效时间为10秒内。
 *
 * @author ww
 */
@Component
public class SameUrlDataInterceptor extends RepeatSubmitInterceptor
{
    public final String REPEAT_PARAMS = "repeatParams";

    public final String REPEAT_TIME = "repeatTime";
    public static final String REPEAT_SUBMIT_KEY = "lm_repeat_submit:";
    // 令牌自定义标识
    private String header="token";
    @Autowired
    RedisUtils  redisTemplate;

    /**
     * 间隔时间，单位:秒 默认10秒
     *
     * 两次相同参数的请求，如果间隔时间大于该参数，系统不会认定为重复提交的数据
     */
    @Value("${limit.time}")
    private int intervalTime = 10;


    @SuppressWarnings("unchecked")
    @Override
    public boolean isRepeatSubmit(HttpServletRequest request,String limitSec)
    {
        String nowParams = "";
        if (request instanceof RequestReaderHttpServletRequestWrapper)
        {
            RequestReaderHttpServletRequestWrapper repeatedlyRequest = (RequestReaderHttpServletRequestWrapper) request;
            nowParams = repeatedlyRequest.getBodyString(repeatedlyRequest);
        }

        // body参数为空，获取Parameter的数据
        if (StringUtils.isEmpty(nowParams))
        {
            nowParams = JSONObject.toJSONString(request.getParameterMap());
        }
        //注解上设置了值 就用设置值 ，不用全局配置的
        if (org.apache.commons.lang.StringUtils.isNotBlank(limitSec)) {
            intervalTime = Integer.parseInt(limitSec);
        }

        Map<String, String> nowDataMap = new HashMap<String, String>();
        nowDataMap.put(REPEAT_PARAMS, nowParams);
        nowDataMap.put(REPEAT_TIME,String.valueOf(System.currentTimeMillis()));

        // 请求地址（作为存放cache的key值）
        String url = request.getRequestURI();

        // 唯一值（没有消息头则使用请求地址）
        String submitKey = request.getHeader(header);
        if (StringUtils.isEmpty(submitKey))
        {
            submitKey = url;
        }

        // 唯一标识（指定key + 消息头）
        String cache_repeat_key = REPEAT_SUBMIT_KEY + submitKey;

        Object sessionObj = redisTemplate.getCacheObject(cache_repeat_key);

        if (sessionObj != null)
        {
            Map<String, String> sessionMap = JSONObject.parseObject(sessionObj.toString(), new TypeReference<Map<String, String>>(){});

            if (sessionMap.containsKey(url))
            {
                Map<String, String> preDataMap =JSONObject.parseObject(sessionMap.get(url), new TypeReference<Map<String, String>>(){});
                if (compareParams(nowDataMap, preDataMap) && compareTime(nowDataMap, preDataMap))
                {
                    return true;
                }

            }
        }
        Map<String, Object> cacheMap = new HashMap<String, Object>();
        cacheMap.put(url, nowDataMap);
        redisTemplate.setCacheObject(cache_repeat_key, JSONObject.toJSONString(cacheMap), intervalTime, TimeUnit.SECONDS);
        return false;
    }

    /**
     * 判断参数是否相同
     */
    private boolean compareParams(Map<String, String> nowMap, Map<String, String> preMap)
    {
        String nowParams =   nowMap.get(REPEAT_PARAMS).toString();
        String preParams = preMap.get(REPEAT_PARAMS).toString();
        return nowParams.equals(preParams);
    }

    /**
     * 判断两次间隔时间
     */
    private boolean compareTime(Map<String, String> nowMap, Map<String, String> preMap)
    {
        long time1 =Long.parseLong(nowMap.get(REPEAT_TIME));
        long time2 = Long.parseLong(preMap.get(REPEAT_TIME));
        if ((time1 - time2) < (this.intervalTime * 1000))
        {
            return true;
        }
        return false;
    }
}
